Lecture Notes Nov 12 2007 CHEM135 Johnson

Lecture Notes Nov 12 2007 CHEM135 Johnson - Lecture Notes...

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Lecture Notes from Monday, November 12, 2007 CHEM135 Dr. Johnson Simple cubic cell 1 atom/cell Body centered cubic cell 2 atoms/cell Face centered cubic cell 4 atoms/cell Crystalline iron has a cubic lattice. The unit cell edge length is 287 pm. The density of this solid is 7.87 g/cm 3 . Calculate the number of iron atoms in one unit cell. # Fe atoms/cell = (mass cell)/(mass Fe atom) = (V)(d)/(mass Fe atom) = (a 3 )(d)/ (mass Fe atom) List of Intermolecular Forces by strength (IMF) (Strongest at the top): Kind of Compound Stronger IMF from: Ion-ion Ionic High charges, small cation Hydrogen Bonding Covalent with N, O, or F Electron rich, higher electronegativity Dipole-dipole Covalent polar Large molecular dipole dispersion all Large molar mass Dispersion forces arise from the following interactions: Ion - induced dipole Between an ion and a nonpolar molecule or atom Na + and Ar Dipole - induced dipole Between a polar molecule and a nonpolar molecule or atom HCl and Ar Induced dipole-induced
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This note was uploaded on 04/07/2008 for the course CHEM 135 taught by Professor Brooks during the Fall '08 term at Maryland.

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Lecture Notes Nov 12 2007 CHEM135 Johnson - Lecture Notes...

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